Method and Apparatus for Proximity Detection for Device Control

1. A controller for granting a user input device control of a lighting device comprising at least one light source, the controller comprising: a receiver arranged for receiving a first sound signal recorded within a first time frame by a first sound sensor and a second sound signal recorded within a second time frame by a second sound sensor located at the user input device, and for receiving a control command based on user input from the user input device, and a processor arranged for determining a level of similarity between the first sound signal and the second sound signal, and for determining, based on the level of similarity, whether the first and second sound signals were recorded in the same control space of the lighting device, wherein the first time frame and the second time frame at least partially overlap, and for granting the user input device control of the lighting device if a sufficient level of similarity has been determined, wherein the controller is further arranged for controlling the lighting device based on the control command when control of the lighting device has been granted to the user input device.

2. The controller of claim 1 , wherein the processor is further arranged for filtering at least one sound characteristic from the first sound signal and/or at least one sound characteristic from the second sound signal before determining the level of similarity.

3. The controller of claim 1 , wherein the controller further comprises a transmitter arranged for transmitting a request signal to the first sound sensor and/or the second sound sensor, the request signal requesting the sound sensors to transmit the first sound signal and the second sound signal to the controller.

4. The controller of claim 3 , wherein the receiver is further arranged for receiving a connection request from the user input device for connecting to the lighting device, and wherein the transmitter is arranged for transmitting the request signal based on the connection request.

5. The controller of claim 1 , wherein the controller is further arranged for communicating to the user input device for which one or more lighting devices control has been granted.

6. A system for granting a user input device control of a lighting device comprising at least one light source, the system comprising: a first sound sensor, the lighting device, and a controller comprising a receiver arranged for receiving a first sound signal recorded within a first time frame by the first sound sensor and a second sound signal recorded within a second time frame by a second sound sensor located at the user input device, and for receiving a control command based on user input from the user input device, and a processor arranged for determining a level of similarity between the first sound signal and the second sound signal, and for determining, based on the level of similarity, whether the first and second sound signals were recorded in the same control space of the lighting device, wherein the first time frame and the second time frame at least partially overlap, and for granting the user input device control of the lighting device if a sufficient level of similarity has been determined, wherein the controller is further arranged for controlling the lighting device based on the control command when control of the lighting device has been granted to the user input device.

7. The system of claim 6 , wherein the system further comprises a speaker arranged for producing a third sound signal, and wherein the processor is further arranged for determining a level of similarity between the third sound signal and the first sound signal and/or the second sound signal, and for granting the user input device control of the controllable lighting device if a sufficient level of similarity has been determined.

8. The system of claim 6 , wherein the controller comprises the first sound sensor.

9. The system of claim 6 , wherein the controller is comprised in the user input device.

10. The system of claim 6 , wherein the controller is comprised in the lighting device.

11. A method of granting a user input device control of a lighting device, the method comprising the steps of: receiving a first sound signal recorded within a first time frame by a first sound sensor, receiving a second sound signal recorded within a second time frame by a second sound sensor located at the user input device, determining a level of similarity between the first sound signal and the second sound signal, and based on the level of similarity, determining whether the first and second sound signals were recorded in the same control space of the lighting device, wherein the first time frame and the second time frame at least partially overlap, and granting the user input device control of the lighting device if a sufficient level of similarity has been determined, the method further comprising the steps of: receiving a control command from the user input device based on user input, and controlling the lighting device based on the control command when control of the lighting device has been granted to the user input device.

12. The method of claim 11 , wherein the first sound signal and the second sound signal comprise background sound recorded at the location of their respective sound sensors.